How many d-block elements are present in the periodic table?
Correct answer: A. 40
- A. 40
- B. 23
- C. 37
- D. 30
Explanation
The number of elements present in the d-block of the periodic table is 40. Four series of transition elements (each series having 10 elements) constitute a d-block. Hence, A is the correct option.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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